We put a home made caltrac on my buddies 52 ford PU
and it works great... he was running the 275 DR and
was getting 1.52 60'(460 ci BBF)but now he has 315 DR
and has to find the right pressure that the tire wants..
so if its in the lower hole I would back off the pre
load till its just touches then lower the tire pressure
even more than you think(bigger tire requires less
pressure per the same weight on it).. what rear shocks
and how much does the front lift before the tire
comes off the ground... front travel is mandatory